Spill proof cup lid



FIG. 1 is a perspective view of a spill proof cup lid showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a top plan view thereof, showing the environment of use with the broken line indicia not being a part of the claimed invention.

The dash lines by the sip area in FIGS. 1, 2, 7 and 8 represent score lines. 

The ornamental design for a spill proof cup lid, as shown and described. 